In terms of total portfolio it ranges from a few percent to ~30 percent. But that’s dependent on amount previously invested.
A better measure might be percent of total yearly investment that goes into crypto, since we’re talking about inflow. I’d put that at around 20%, with the other 80% going towards retirement and socks/etfs
In a world of regular professionals following the religion of Dollar Cost Averaging, the monthly contribution as % of income actually gives a good indication to their current level of faith.